Heating furnace



w. A. TOOHER' HEATING FURNACE Filed July 2, 1924 A 7' TOR/YE v5 Patented July 14, 1925.

PATENT OFF-ICE.

WILLIAM A. TOOHEB, OF ST. LOUIS, MISSOURI.

HEATING FURNACE.

Application filed July 2,

To all whom it may concern.

Be itknown that I, WILLIAM A. TOOHER a citizen ofthe United States of America, a resident of the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements inHeating Fur- .naces, of which the following is a full,

clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates generally to heating furnaces, and particularly to a simple and inexpensive casing for a heating furnace which is provided with an inner lining member spaced apart from the outer wall of said casing in a manner to provide an an nular air space which surrounds the heatproducing medium of said furnace. The air space mentioned is for the purpose of resisting the chill of the exterior and to reduce the volume of heat dissipated through the medium of radiation.

It has been found in practice that the best results are obtained when the furnace casings forming parts of certain makes of furnaces are provided with air spaces which are approximately a one inch in width. Prior to this invention it was found that it. was a rather difficult matter to maintain a uniform spaceall around the furnace for the reason that the lining members which formedthe inner walls of said air spaces were capable of movement relative to the outer walls of the furnace. Hence it quite frequently happened that the air space of a furnace would be approximately one-half inch in Width at one side of the furnace and an inch and a half at the other side of said furnace.

The main object of the present invention is to eliminate the difficulties suggestedabove, and I have therefore devised a very simple and inexpensive casing structure which is so arranged that the walls which form the air spaces mentioned are in fixed relation to each other whereby a uniform air space is maintained atall times.

Another object of the present invention is to provide a heating furnace of the class described with a baffle member which is interposed between the heat-producing element of the furnace and the air space there of, said baflie member being intended to provide additional means for reducing the volume of heat dissipated through the means of radiation.

1924. Serial No. 723,681.

With the foregoing and other objects in view, the invention comprises the novel construction, combination and arrangement of parts hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown the preferred, embodiment of the invention. However, it is to be understood that theinvention comprehends changes, variations and modifications which come within the scopeof the claims hereunto appended. i

Fig. I is a front elevation of-afurnace made in accordance with my invention, part ofthe casing of said furnace beingbroken away to show the interiorof said furnace.

Fig. II is an enlarged fragmentary verticalsection showing the manner in which the air space is arranged. and alsoshowing the ba'flie member associated with thefurnace.

Fig. III is a cross section on the line III.III of Fig. I.

Fig. IV is an enlarged cross section showing the manner of connecting together the ends of the outer wall and the inner lining member ofthe furnace.

In the drawing, A designates a furnace made in accordance with my invention, said furnace comprising the usual combustion heater B, which is provided with the usual appurtenances, such as a fuel door, an ash door and draft-regulating devices, which need not be described herein. Arranged around the lower portion of the combustion heater B is a base section 1, which is in the form of an annular sheet of metal extending upwardly from the floor, said base sec tion being provided with an annular bead 2 which performs the doublefunction of strengthening said section and acting as a stop for the section of the furnace casing which is arranged above said base section.

Located above the base section 1 is an intermediate casing section 3. The intermediate casing section 3 comprises a sheet of metal which is shaped so that it is circular in cross section and the ends of said sheet of metal are joined together to produce an annular wall. To permit the ends of the intermediate casing section 3 to be drawn together to provide a reasonably tight joint, I provide one of said ends with an outwardly extending vertical flange 4 (Fig. IV), which flange is formed by bending a portion of the metal of said casing metal backwardly on said outwardly ex-f single ply outwardly extending flange 6,

which is formed by merely bending the extreme end portion of said annular sheet of metal outwardly, as shown in Fig. IV.

In arranging the intermediate casing member 3 above the base member 1, said intermediate section is so located that the lower portion thereof surrounds that portion 7 of the base section which is above'the annular bead 2. The endsof the intermediate section are then drawn together and bolts 7 are passed through the 2-ply flange 4 and the single ply flange 6' to securely fasten the opposite ends of the intermediate section together. When the end portions of the intermediate section 3. are drawn together as described, it is apparent that-a very tight joint will be obtained because of the fact that there is very close contact between the comparatively wide portion 5 and the adjacent portion of the member 3 and between the flanges 1 and o Located above the intermediate casing member 3 is the bonnet 8 of .the furnace, said bonnet 8 being of the usual construction and being provided with a lower portion which is surrounded by the upper portion of the intean-ediate casing member 3,. Itis plain from the foregoing that the elements of the fur-ance which compose the outer casing thereof are very securely connect-ed together, the lower and upper por tions of the intermediate member 3 surrounding the upper portion of the base member 1 and the lower portion of the bonnet 8, respectively, and the ends of said intermediate member 3. being drawn tightly together to cause said base member and said bonnet to betight-ly gripped by said inter mediate sectlon.

Located adjacent to the lower portion of the bonnet 8 is a ring 9. The ring 9 is HI.- ranged concentric with the circumferential wall of the bonnet 8, and said ring is of such diameter that an annular space is provided between said ring and the inner face of said circumferential wall of the bonnet. To sup port the ring 9 I employ a plurality of brackets 10 which are preferably approximately Z shaped and are riveted orvotherwise secured to the wall of the bonnet 8, and to said ring 9, as'shown in Figs. I and III. Located adjacent to the upper end of the base member 1 is a second ring 11 which,

like the ring 9, is spaced apart from the;

ring 11 is secured to the upper portion of the base member 1 by means of substantially Z-shaped brackets 12 similar to the brackets '10 which support the ring 9.

Supported by the rings 9 and 11 is an inner lining member 13. The inner lining member 13 is an exact counterpart of the intermediate casing member 3, except that said inner lining member is smaller in'diameter. The inner lining member, like the intermediate casing member, is shaped to form a circle in cross section, and the end portions of said inner lining member are provided with a 2-ply flange 1 1 and a single ply flange 15, which are adapted to be drawn together by bolts 16 to provide a tight oint, as shown in Fig. IV. The 2-ply flange 14: is. also provided with a portion 17 which is similar to and functions like the portion ,5 of the 2-ply flange 4 on the intermediate casing member 3. As shown clearly in Fig. III, the upperportion of the inner lining member 13 overlaps and surrounds the lower portion of the ring 9,.and the lower portion of said inner lining member overlaps and surrounds the upper portion of the ring11. It is plain from the foregoing that the rings 9 and 11 are in fixed positions relative to the outer casing wall ofthe furnace, and it is likewise plain that when the ends of the inner lining member 13 are drawn'together so that said inner lining member grips said rings 9 and 11, said inner lining member 13 will also be held in a fixed position relative to the outer wall of'the casing, so that an annularair space of uniform width throughout will be provided, which space will re"-' main uniform during the life of the furnace."

An important feature in connection with the furnace casing disclosed herein resides in the ease which it may be assembled, it being quite apparent that there is no accurate fitting together of parts as there is in connection with the casings of some furnaces now in use. The intermediate casing member 3 and the inner lining member 13 are expanded when the casing is being assembled, consequently they will very readily slip into place, afterwhich said parts may bedrawn together by the bolts 7 and 16 to tightly connect the various parts of the easing together. r

I have found by experiment that the volume of heat dissipated through the medium of radiation is greatly reduced by interposing a baffle such as that designated by the reference character 18 between the air space of the furnace casing and the combustion heater B thereof. The baflie 18 is semi-circular in cross-section as shown in Fig. II, and is "of such diameterthat it is spaced some distance inwardly from the inner lining member 13. As a means for supporting the bafiie member 18 I employ a ring-19, which is located within the ring 9 (Figs. I and II), and said ring 19 is supported by the ring 9 through the medium of a plurality of brackets 20. Located at the upper edge of the baffle member 18 is a pair of hook-shaped members 21 which are adapted to engage the ring 19, as shown in Figs. I and III, so as to support the bafiie member. As will be seen by referring to Fig. III, the baffle is not supported at its lower end, said baffle merely being suspended from the ring 19.

I claim:

1. A heat-ing furnace comprising a com bustion heater, an outer casing, a lining member located within said outer casing and spaced apart therefrom to provide an unobstructed air space which extends entirely around said combustion heater, said lining member comprising a sheet of material having ends capable of being drawn together to reduce the diameter of said lining member, means whereby a comparatively air-tight joint is provided between the cooperating end portions of said lining member, and means whereby said lining member is retained in a fixed position relative to said outer casing of the furnace, said means comprising an annular member arranged-at the upper end of said lining member and located entirely within said outer casin 2. A heating furnace comprising a combustion heater, an outer casing, a lining member located within said outer casing and spaced apart therefrom to provide an unobstructed air space which extends entirely around said combustion heater, said lining member comprising a sheet of material having ends capable of being drawn together to reduce the diameter of said lining member, means whereby a comparatively airtight joint is provided between the cooperating end portions of said lining member, and means whereby said lining member is retained in a fixed position relative to said outer casing of the furnace, said means comprising annular members arranged at the upper and lower ends of said lining member, said annular members being located entirely within said outer casing and being frictionally gripped by said lining member.

3. A heating furnace comprising a combustion heater, an outer casing, a lining member located within said outer casing and spaced apart therefrom to provide an unobstructed air space which extends entirely around said combustion heater, said lining member comprising a sheet of material bent in circular form and having ends capable of being drawn together to reduce the diameter of said lining member, overlapping means whereby a comparatively air-tight .joint isprovided between the cooperating entirely within said outer casing and. being frictionally gripped by said lining member.

4-. A heating furnace comprising a combustion heater, an outer casing member surrounding saidcombustion heater, an inner lining member arranged within said outer casing member and spaced apart therefrom to provide an air space, means comprising fixed annular members located above and below said inner lining member whereby same is retained in a fixed position relative to said outer casing member, and a baffle interposed between said inner lining member and said combustion heater.

5. A heating furnace comprising a combustion heater, an outer casing member surrounding said combustion heater, an inner lining member arranged within said outer casing member and spaced apart therefrom to provide an air space, means comprising a pair of fixed rings one of which is located,

at the upper edge of said inner lining member and the other at the lower edge thereof whereby said inner lining member is retained in a fixed position relative to said outer casing member, and a baffle interposed between said inner lining member and said combustion heater, said baflle being supported by said upper ring.

6. A heating furnace comprising a combustion heater, an outer casing member surrounding said combustion heater, an inner lining member arranged within said outer casing member and spaced apart therefrom to provide an airspace, means comprising a pair of fixed rings, one of which is located at the upper edge of said inner lining member and the other at the lower. edge thereof whereby said inner lining member is retained in a fixed position relative to said outer casing member, a smaller ring arranged within the aforesaid upper ring and supported thereby, and a baffle suspended from said inner ring, the body of said baflle being interposed between said inner lining member and said combustion heater.

In testimony that I claim the foregoing I hereunto affix my signature.

WILLIAM A. TOOHER. 

